like a normal party but with more computers, less alcohol and no girls.

I didn't go to Ted's party because I had a LAN party planned. I feel sorry for Ted having to spend all his time groping clunge and getting his buzz on when he could have been capturing the flag and pwning n00bs like me.

A LAN party is where a large number of albinos, almost always male, gather in darkened rooms to protect them from the harshness of the sun and the corrosive effects of oxygen, and the bears, which as we all know, live "outside", and can only be guarded against by being inside. They engage in various mental exercises, most often simulated battle, to prepare them for any possible future hostile action taken by "others". These simulations are loaded into computers, which are usually owned and brought by the participants. There is often a small supply of sustenance available at the start, though it is ignored by most of the participants for the first many hours. In fact, many of the participants subsit solely on the copious amounts of stimulants that are available, usually dissolved into liquids with a high energy content. The event usually occurs until the participants are drawn away to other pursuits, most often infiltration missions into the general population.

A sacred ritual where many socially outcast males, of the Nerdus religion, engage in ritualistic murder of eachother (referred to as "fragging") in the hopes that their god Microson will grant them another life, which is referred to as a "respawn" among them. It is also speculated that caffeinated drinks are served. A LAN party has never been witnessed by an outsider before, and therefore everything known about them is speculation.

Guy 1: Dude! Have you seen Eric?
Guy 2: Nah, man. Not since the LAN party.

the phrase "lan" is derived from the abbreviation Local access network, pronounced phonetically.

Having hosted a few myself, I know there usually isnt gay orgy/porn transfer involved...

"lan party" as defined by thinkgeek.com:
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A New Social Ritual Amongst The Elite

If you've never been to a LAN Party, you haven't lived properly (or you suck at gaming). If you suck at gaming, dont despair, you can still go to a LAN party, jack in, and just sniff packets and write code and still have some fun. Or you can be the sysadmin and setup the networking or you can just handle the food and beverages (get me my Bawls!)

Ah, sweet LAN parties...The stimulating scent of caffeine, the verbal jousting, the smell of pepperoni lingering in the air, the floor a tangled infestation of cat5, the neon lights of case mods poking through the scene like lasers in fog. Nothing quite like it. And when the gaming starts, everybody becomes so intense. One frag leads to the next, emotions wax and wane as gibs amass and levels change, here an unnamed player, there an elite commando with uncanny aim. Over time, the LAN party itself, a single organism, breathing, hunting....

Or something like that.
</b>

Gamer 1: Hey man are you going to Sean's for that new-year's LAN party?
Gamer 2: Nah, I'm too much of a rookie, you guys would own the hell out of me :(